Towards the identification of new physics through quark flavour violating processes

Abstract

We outline a systematic strategy which should help in this decade to identify New Physics (NP) beyond the Standard Model (SM) by means of quark flavour violating processes and thereby to extend the picture of short distance physics down to the scales as short as 10 −20 m and even shorter distance scales corresponding to energies of 100 TeV. Rather than using all possible flavour violating observables that will be measured in the coming years at the LHC, SuperKEKB and in Kaon physics dedicated experiments at CERN, J-PARC and Fermilab, we concentrate on those observables that are theoretically clean and very sensitive to NP. Assuming that the data on the selected observables by us will be very precise, we stress the importance of correlations between these observables as well as of future precise calculations of non-perturbative parameters by means of lattice QCD simulations with dynamical fermions. Our strategy consists of twelve steps which we will discuss in detail illustrating possible outcomes with the help of the SM, models with constrained Minimal Flavour Violation (CMFV), MFV at large and models with tree-level FCNCs mediated by neutral gauge bosons and scalars. We also briefly summarize the status of a number of concrete models. We propose DNA-charts that exhibit correlations between flavour observables in different NP scenarios. The models with new left-handed and/or right-handed currents and non-MFV interactions can be distinguished transparently in this manner. We emphasize the important role of the stringent CMFV relations between various observables as standard candles of flavour physics. The pattern of deviations from these relations may help in identifying the correct NP scenario. The success of this program will be very much facilitated through direct signals of NP at the LHC even if LHC will not be able to probe the physics at scales shorter than 4×10 −20 m. We also emphasize the importance of lepton flavour violation, electric dipole moments and (g − 2) e,µ in these studies.

B → K ∗ ν ν ¯ $$ B\to {K}^{\left(\ast \right)}\nu \overline{\nu} $$ decays in the Standard Model and beyond

“…We observe good agreement with the SM pointc i = 0, except for the combination Re(c (1) ql +c (3) ql ). This is due to the tensions recently observed in B → K * µ + µ − angular observables and branching ratios of exclusive b → s transitions (cf.…”

“…We consider first the general case of Z models in which a single Z gauge boson dominates the scene. In this case, only the coefficients c (1) ql , c qe , c de and c dl are non-vanishing and we find…”

“…The colored arrows in these plots correspond to the 2σ allowed ranges of the individual Wilson coefficients as in (3.22), with the direction of the arrow pointing from negative to positive values for thec i . The blue arrows correspond toc Z , the yellow ones toc Z , the green ones toc (1) ql (solid) orc (3) ql (dashed), and the red ones toc dl . Apart from R K and R K * , we also show the impact on the branching ratios of B s → µ + µ − as well as of B → Kµ + µ − and B → K * µ + µ − at high q 2 , defined as [15,22] BR( 25) where the superscripts refer to the range in q 2 in GeV 2 .…”

A roadmap to control penguin effects in B d 0 → J/ψK S 0 and B s 0 → J/ψϕ

“…[52,53] on a phenomenological basis, arises actually in extensions of the SM going beyond "minimal flavour violation" (MFV), which are characterised by flavour-universal CP-violating NP phases (for an overview, see ref. [54]). In this specific class of NP, referred to as non-MFV models, we obtain the following correlation:…”

Lepton-flavored scalar dark matter with minimal flavor violation

“…the MFV hypothesis postulates that Yukawa couplings are the only sources for the breaking of flavor and CP symmetries [5][6][7][8][9][10][11][12][13]. Its application to the study of DM carrying quarkflavor quantum numbers was first proposed in ref.…”